Tool holder



Jne 24, 1930. J. c. HuRowlTz TOOL HOLDER Filed OCb. 5, 1927 Patented June 24, 1930 i UNITED STATES PATENTsession JAY C. HUROWITZ, oF NRW YORK, N. Y., AssiGNoR fro L. W. JoNRs Toon COMPANY, INCORPORATED, iA CORPORATION-or NRW -YORR l TOOLy yHOLDER Application `filed October 5, 192'?.A Serial No. 224,201.

*My invention relates to tool holders, bit

stocks and chucks, such as are used in confl nection with various tools, such, -for instance as boring bits, it having been devised with f especial reference to being used in extension bits, such as are commonly employed by elec tricians making openings through the walls forelectric conduits and conductors. These tools have frequently to be used in inaccessiblev V1o places, requiring employment either of a very long tool or else of a long tool holder. Sometimes the auger or bit being.V used becomes stuck in thehOle being formed, vmaking lit difficult to extract it.

My invention has particularly for its object to produce a tool holder that, having `been once made'to engage with the tool, will mainf tain such engagement'nduringv all of the .ordinary. uses to which fsu'ch tool would be subv120 jected without liabilityof the ygrip of the holdery becoming loosened. I'have illustrated in the accompanying drawings my invention applied vto a boring bit and the holder r or Vcarrier therefor. 25 F'g. lis an elevation, with Vpartsin longitudinal section, showing the invention applied to a holder for an auger orwoodboring tool, the'parts` being assembled in workingv relationship. Y

. Fig.12 is anv elevation ofthe parts shown I inF-ig. 1, thesehowever, being Aseparated from each other. E 1 I Fg is a transverse sectional view taken on the line 3, 3 of Fig. 1. f

Fig. 4 is a transverse sectional view taken on the line 4,4of Fig. 2. Y

. Figs.- 56, 7 8, `and 9 are :views*illustrating vthe several steps y.employed infproducing the .clampingj aws orshells ofthe tool holder. f

v f Referring toV the drawings, 2 indicates the ltool,fin,this instance -a Wood boring'auger. Itisfformed with thelusualkshank Sand a taperinghead 4, vpreferably angular in cross section. 5 designates the driving Yspindle of the tool' holder or yc'arri'er'in theend 7 of Whichis formed a socket 6 to receive thehead of the jtool, suchfhead beingatitsend externally screw-threaded, as .indicated at 8, to receive a sleevek 94v adapted 4to itf over4 the -head of'thetool-and the adjacent' portion vof,

' applied 'l thereto.

ably' beveled circumferentiallyat one end,

the shank 3 thereof when the parts are assembled as shown in Fig; l. The outer end `of this sleeve is formed with an inturned flange 10,surrounding .the opening, whichl is preferably of a size and shape to permit it to pass over the angularheadvl of the tool, seeFigt. f

l 12, 12 indicate a pair of clampingjaws adapted to encirclerthe. stem 3 Vofthetol and to liek within thel sleeve 9 when the parts are assembled.- Each jaw is a'shell, of arc shape in crosssection,'as represented in Fig.

'3, yadaptedto fit the shank of the tool when 1.

n The" jaws are Lpivotally united by a hinge or pivotal connection that isparallel withthe axis ofthe shank of the Atool when the jaws are appliedthereto. ASuch connection insures that-the two clamping jawsshallbe permanentlyunited'in Working Yrelationship preventingk their `separation and alwaysmaintainingthem inproper relationl lship forgapplication to the tool'and for erf-A "fof f gagement Ytherewith..-V The `jaws are prefer- 'i as n indicatedA at 16, and with heg-e 'beveled POIODS engage the nturned flangev loxof the-sleeve 9.y -f' The invention .thus far described is as f follows z The sleeve 9 is slippedloverLv thefhead:411781) v i of-l theV tool and movedfforvvardalongthe shank thereof, leaving a portion'lv of the 'lat'y- 'ter between the j sleeve andthe Vhead @eX-Q posedfThe jaws*12,"12 are'lthen opened,V

lupon their hinge connections andiapplied vto thesaideXposed portion of the shank fof the tool and causedto"surroundandeinbrace the same as representedin Fig. 2. The sleeve v9 is 4then slippedl over the jaws, the tapering head'of the tool is inserted into the socket 6 in the tool holder, andthe sleeve 9 causedv to engage with the screw-threaded end 8 at theendof the'tool-holdenj The enthe tool holder draws Vthe parts `together into "the, positions represented in'Fig. 1,V the inner ends of the j awsresting against the shoulbeveled portions 16VA ofY theja'ws, .causing the y,gg-agelnent,l ofthe sleeve With the thread'of latter to be forced vinto clamping and holding engagement withthe tool, which is thus tighti' ly forced into the socket 6 and, there held securely. The jaws 12, 12 grip the stein of the tool well in advance of the socket 6,

Y which is an advantage, and they are entirely concealed and protected bythe sleeve 9.

In order to lock the sleeve 9 in position to hold the jaws in tight clamping engagement with the stem. of the tool, l mount upon the head 7 of the tool holder a locking sleeve 17. The end of this sleeve is crenulated as at24 to engage a similarly crenulated end of theV sleeve 9.

Through the sleeve 1'? is formed a longitudinal yslot 18 in Vwhich lies the exposed portion of a screw'19that is seated in a diametric opening 25 through the head -7 of the stem of rthetool carrier'. AThis pin -or screw 19 limits the extent of longitudinal movement of the sleeve and preventsV it Vfrom rotative .-In'ovement.V On the side of the sleeveY OPPO* sitevthev slot 18fisfa series of holes orperorations 22. Acoiled. spring 20is inserted in the hole 25, -its end resting `against the inner end of the screw-threaded pin 119, and against the outei` end of this spring rests a metal ball 2l, which, when forced into; the hole 25,'putsthe Y springiuider tension.V vThe ball-2l thus acts sleeve-1n the positiontov which 1t may be adj usted, bylpartially entering one of the holes asa spring' detent to yieldingly hold the VV22.'.v lThe clamping sleeve 9 having 'been screwed into positionfto cause thev j awsto I* .3.5

Vproperly grip. the shank ofthe tool, the lockfsleeve 17 is V*pushed forward until` the ,'Cr.enulff'nied ends 28g and 24: Vof the two sleeves in terineslnl vThis engagementYY will; prevent any accidental Vor unintentional turning of .theclampingsleeve 9, andhence any-loosen- .of the gripping actionof the jaws 12, 12-, I

V an'dit is maintained by the spring detent 2l,

72777'which latter, howev'ei,v permits the locking sleeve tov be slid back todisengagetheclamp- 'ing'sleeve wheneverthis becomes desirable.

' The methodof makingfand assembling the clamping jaws 12, 124 is represented in Figs.

*55.1109 inclusive. VThe first step 'in' the manufacture is to cut out blanks from sheet metal, represented atl-2n, 1:21Fig.,4 5. The'blank .12aV is formedwith acentralf, relatively long,

knuckle V1 1`,whil e theIblank-lflb is formed with two ire'latively y 'short' Vknuckles adaptedto straddle oryembrace the knuckle 11%.,1 -When thefblank121v is Y formed thev knuckles 13. flare, as repeseritedin Figp.VV The next steps in 'v the manufacture,'-whieh Vare represented` in Fig. 6', are to. form recesses Min the ends of fthe knuckle 11 andteats 15 on the inner faces oftheknuckles 13, this being doneby suitable dyes. l Illhel third stepgis to. curve the flat blanks1'2a' and 12b toforin theclampingshellikejaws 12 and-12,apd.thisstep sndcated fin-,Fgg i The next step. in: the manuiacture is to Y M semble the two jaws, whichis done by inserting thev longer knuckle 11 of the jaw 12 between the shorter outside knuckles 13 of the jaw 12, and then by a suitable press bendf ing the knuckles 13 into the positions represented in Fig. S, causing the teats 15. to enterV The final step in the manufacture, which preferably takes place after the jawshave been hinged together," is to bevel one end thereof as indicated at 16, and the finishedV product shown in Fig.' 9 results. In the manufacture of the clamping jaws as just described l prefer that teats 15v should be integral with the knuckles which carry them, While these "teatsarcqshown as Y the recesses 14, thus uniting the two jaws by Y hinge-like connections.

carried by the'shorter, bendable' knucklesil,

curved jaws adapted to` encircle and" clamp.

Vjaws for forcing them into` clamping engage-y ment with the tool, said sleevehav-ing screwthreaded engagement with Vthe "spindle, another sleeve having sliding engagementupon the spindle, andl spring' pressed meanscarried Y 100 sleeve against rotation, the, two sleeveshavby said vspindle for Vrestraining the` latter v ing their ends constructed to interlockv whenv sleeve.

2.V A, tool holder consisting ofa socketed the shank of the tool, a sleeve sliding over the 'Y Vthesliding sleeve is moved Vtowardl the clamp spindle, screw-threaded n earJ-its Vend., `and 'through which .isaformedfa transverse openjawslfor engaging withift'he ing, clamping shank of a tool--insertedinfthe socketof`t heV` spindle, a. sleeve havingscre'w-threaded engagement with the spindle.constructed:to

close the-clamping jaws and-force them: into engagement with the. toolfv'shank and also to` Voperate to hold the/toolin` the socket 'infth'e' e. spindle, the .end of the sleeve being notched, f

a secondlocking sleeve supportedupon the A spindle, formed with-a longitudinal slot and a series of openings diametrically opposite the slot, a pin situated inthe transverse open'- of-the pin ing through 'ther` spindle the head lying'- in the slot of the lockinglsleeve permitvting the latter ltol benioved longitudinally but f withinsaid 'Y notrotatively, a spring situated transverse opening, a ball serving as adetent bearing against the outer end ofthe said 1,

spring Vand beingthereby adapted to be forced` selectively into oneor another of theVY openings through` the 'lockingjsleevethat areV opposite ythe slotv therein, the; end ofthe lockiao cof-l Y' ing sleeve being notchedto interengage with the notched edge of the clamping sleeve'.

3. Clamping jaws for atool holder, of cylindrical shape and consisting of arc-shaped, shell-like pieces, one of them having 'a central broad knuckle extending alongone lon-y gitudinal edge-thereof, `andthe other having narrower bendableknuckles at the ends of one of its longitudinal edges,.between which narrower knuckles lthe broad knuckle of the Vfirst named piece is adapted to lie,V 'and inter 

